T9

TACS

TACS - Total Access Communications System (an AMPS variant deployed in a number of countries principally the UK)

Talk-time

Talk-time - The length of time a battery can power a mobile phone when making or receiving calls

TAP

TAP - Transferred Account Procedure; the essential charging methodology for international GSM roaming. There have been four TAP standards, TAP1, TAP2, TAP2+ and TAP3. The latter offers variable record length and is sufficiently flexible to support all future requirements arising from the move to 3G

TBR

TCH

TD-CDMA

TD-SCDMA

TD-SCDMA - Time Division-Synchronous CDMA; a CDMA variant developed by Chinese vendors which is claimed to offer high data rates and greater coverage

TDD

TDD - Time Division Duplex; a radio technology for use in unpaired spectrum. WCDMA/UMTS includes a band for TDD mode usage and both PHS and DECT use this technology

TDMA

TDMA - Time Division Multiple Access; a technique for multiplexing multiple users onto a single channel on a single carrier by splitting the carrier into time slots and allocating these on a as-needed basis

Telematics

Telematics - A wireless communications system designed for the collection and dissemination of information, particularly refers to vehicle-based electronic systems, vehicle tracking and positioning, on-line vehicle navigation and information systems and emergency assistance

TETRA

TETRA - Terrestrial Trunked Radio; a European developed digital private mobile radio technology which is now being extensively deployed worldwide

Tetrapol

Tetrapol - A competitive digital PMR technology to TETRA developed by French vendors

TFD

TFD - Thin Film Diode. A type of LCD display technology. TFD technology combines the excellent image quility and fast response times of TFT, with the low power consumption and low cost of STN.

TFT

TFT - Thin Film Transistor. A type of LCD display technology. Compared to other types of LCD technology, TFT features excellent image quality and response time, but uses more power, and is more expensive.

TFTS

TFTS - Terrestrial Flight Telephone System

Timeslot

Timeslot - A frame within a TDMA schema; has a time interval of 576 microseconds. Physical content of a timeslot is known as a burst. Five different burst types exist, they are distinguished by different TDMA frame divisions (see NB, FB, SB, AB and DB)

TIPHON

TIPHON - Telecommunications and Internet Protocol Harmonisation over Networks; an ETSI project designed to support the market for voice communications and voice band communications. In particular TIPHON will ensure that users on IP-based networks can communicate with those on circuit switched networks